iMessage not syncing with my phone contacts
i recently purchased a macbook pro and when I open iMessage it is not syncing with most of my phone contacts. It shows some contacts as names but most as just their phone numbers on iMessage on my mac. I also have 2 apple ID accounts which I am trying to get rid of one and merge the 2 accounts. Please help. Thank you!
MacBook Pro (Retina, 13-inch,Early 2015), iOS 10